Unusual fluorescent monomeric and dimeric dialkynyl dipyrromethene-borane complexes.

Novel monomeric and dimeric dialkynyl borondipyrromethene dyes (E-Bodipy) have been prepared in two different ways, providing systems in which the boron center is attached to either two similar or two dissimilar acetylenic units incorporating chromophores such as pyrene or anthracene. Both families exhibit interesting fluorescence and redox properties in which almost quantitative intramolecular energy transfer occurs.